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Geomorphic Terrains and Evidence for Ancient Volcanism within Northeastern South Pole-Aitken BasinThe interior of the enigmatic South Pole-Aitken Basin has long been recognized as being compositionally distinct from its exterior. However, the source of the compositional anomaly has been subject to some debate. Is the source of the iron-enhancement due to lower-crustal/upper-mantle material being exposed at the surface, or was there some volume of ancient volcanism that covered portions of the basin interior? While several obvious mare basalt units are found within the basin and regions that appear to represent the original basin interior, there are several regions that appear to have an uncertain origin. Using a combination of Clementine and Lunar Orbiter images, several morphologic units are defined based on albedo, crater density, and surface roughness. An extensive unit of ancient mare basalt (cryptomare) is defined and, based on the number of superimposed craters, potentially represents the oldest volcanic materials within the basin. Thus, the overall iron-rich interior of the basin is not solely due to deeply derived crustal material, but is, in part due to the presence of ancient volcanic units.
Document ID
20120011922
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Petro, Noah
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mest, Scott C.
(Planetary Science Inst. Tucson, AZ, United States)
Teich, Yaron
(Walter Johnosn High School Bethesda, MD)
Date Acquired
August 26, 2013
Publication Date
August 1, 2010
Publication Information
Publication: Recent Advances and Current Research Issues in Lunar Stratigraphy
Volume: 477
Subject Category
Geophysics
Report/Patent Number
GSFC.JA.01186.2012
Distribution Limits
Public
Copyright
Other

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